What to Do After a Flood: Step-by-Step Guide

Floods kill more Americans than any other weather event. The damage continues long after the water recedes — through mold, structural compromise, and electrical hazards. What you do in the first 72 hours after a flood determines whether your home is salvageable or becomes a total loss. This guide gives you the exact sequence to follow.

Before You Re-Enter: Wait for Official Clearance

This step is not optional. Even after floodwaters appear to recede, your home may be structurally compromised, electrically live, or contaminated with sewage. Every year, people die from electrocution, structural collapse, and carbon monoxide poisoning when they re-enter flooded homes too quickly.

Wait until:

• Local authorities issue an all-clear for your neighborhood
• Your utility company confirms electrical service has been disconnected or inspected
• Standing water around the home has fully receded
• You have confirmed there are no gas leaks (call your gas company)

See our complete guide on whether it is safe to return home after a flood before setting foot inside.

Step 1: Document Everything Before Touching Anything

Your insurance claim begins the moment you walk in the door. Before moving a single piece of furniture or pulling up a single piece of flooring, spend 20-30 minutes photographing and video-recording every room, every wall, every damaged item.

What to document:

• Water lines on walls (shows the maximum flood depth in each room)
• All damaged furniture, appliances, electronics, clothing, and personal property
• Damage to flooring, drywall, insulation, and structural elements
• Any pre-existing damage that the flood may have worsened
• The exterior of the home — foundation, siding, windows, doors

Upload photos to a cloud storage service immediately so they cannot be lost if your phone is damaged. Create a written inventory of damaged items with estimated purchase dates and values. FEMA and your insurer will both need this documentation.

Step 2: Contact Your Insurance Company

File your flood insurance claim as quickly as possible — ideally within 24 hours of gaining access to your home. National Flood Insurance Program (NFIP) policies have specific documentation requirements and timelines. Missing deadlines can reduce or invalidate your claim.

When you call:

• Have your policy number ready
• Report the date and cause of flooding
• Ask for the name and contact information of your assigned adjuster
• Ask specifically about the "Proof of Loss" deadline — typically 60 days
• Ask whether you need to get contractor estimates before the adjuster arrives or after

Do not throw away damaged items until your adjuster has seen them. Many homeowners make this mistake and lose the ability to claim those items. If you must discard materials for health reasons (mold-contaminated drywall), photograph everything extensively first.

For detailed guidance on maximizing your claim, read our complete guide to filing a flood insurance claim.

Step 3: Make the Home Safe to Enter

Before beginning any cleanup work, verify these safety conditions:

Electrical Safety

Do not flip any light switches or touch any outlets until a licensed electrician confirms your electrical system is safe. If your electrical panel was submerged, assume it is unsafe until inspected. Floodwater carries conductive debris that can remain in hidden electrical components long after drying. Water in walls surrounding electrical wiring creates shock and fire hazards that are invisible to the naked eye.

Gas Safety

If you smell gas inside or outside your home, do not enter. Call your gas utility from a safe distance. Floodwaters can damage gas line connections and underground infrastructure. A licensed plumber or your utility company must inspect the gas system before you use any gas appliances.

Structural Safety

Before entering, walk around the exterior and look for obvious structural damage: foundation cracks, tilted walls, sagging roof lines, doors and windows that no longer fit their frames. Inside, test each floor before putting your full weight on it. Saturated wood subfloors and joists can fail without warning.

Sewage Contamination

Assume all floodwater is contaminated with sewage bacteria. Wear rubber boots, waterproof gloves, and an N95 or P100 respirator for all cleanup work. Wash hands thoroughly after any contact with flood-affected materials.

Step 4: Remove Standing Water Immediately

Every hour counts. The longer water sits in your home, the more damage it causes — to wood subfloors, drywall, insulation, and structural lumber. Mold colonization begins within 24-48 hours on wet porous materials. Extraction speed is directly linked to restoration success.

Methods by water depth:

Water Depth	Best Tool	Notes
6+ inches	Submersible pump	Discharge outside, away from foundation
2-6 inches	Wet/dry vacuum	Faster for shallower water in smaller areas
Under 2 inches	Wet/dry vac + floor squeegee	Get into corners and under cabinets

A submersible water pump can remove hundreds of gallons per hour and is the fastest tool for significant flooding. For basement flooding specifically, see our guide on how to clean up a flooded basement.

Step 5: Remove Damaged Materials

Once standing water is extracted, begin removing materials that cannot be dried and saved. Acting fast here prevents mold from spreading to salvageable materials.

Remove immediately:

• Saturated carpet and carpet padding — almost never worth saving after flooding
• Wet insulation — loses all thermal value when wet and harbors mold
• Drywall with water lines — cut 12-18 inches above the water line (mold wicks upward through drywall)
• Wet particleboard or MDF furniture — swells, warps, and molds rapidly

Attempt to save:

• Hardwood flooring — if dried quickly (within 48 hours), often can be dried and refinished
• Solid wood furniture — disassemble, dry separately, treat with wood preservative
• Concrete block or poured concrete walls — dry thoroughly, then seal
• Metal appliances (washer, dryer, refrigerator) — dry out components, have professional inspect before use

Step 6: Dry Out the Structure Completely

Water extraction removes visible water. Drying removes the moisture absorbed into wood, concrete, and building materials — and this step takes days, not hours. Running fans alone is insufficient. You need dehumidifiers operating continuously.

A commercial-grade dehumidifier can remove 70-120 pints of moisture per day. Pair with air movers or fans to circulate air through wet wall cavities. Keep windows closed — outside air is often more humid than interior air during humid seasons and slows drying.

Target indoor relative humidity below 50%. Use a moisture meter to test wall assemblies — wood is considered dry when moisture content is below 19%. For detailed equipment recommendations and techniques, see our complete guide on how to dry out a flooded house.

Step 7: Prevent and Treat Mold

Mold colonizes wet porous materials within 24-48 hours. After major flooding, assume mold will grow in every area that remained wet for more than two days. Your job is to prevent it from spreading and to eliminate what has already started.

Apply an EPA-registered antimicrobial or fungicide to all affected surfaces after water extraction. Concrobium Mold Control is widely used by restoration professionals and is safe on wood, drywall, and concrete. It physically crushes mold cells as it dries, leaving a protective barrier.

Apply to:

• All exposed wood framing inside walls
• Concrete or masonry basement walls and floors
• Subflooring and joists
• Any surface that was wet for more than 24 hours

If you see visible mold colonies (black, green, or white fuzzy growth) covering more than 10 square feet, call a certified mold remediation contractor. Disturbing large mold colonies without proper containment spreads spores throughout the home.

Step 8: Apply for Federal Disaster Assistance

If your flooding occurred during a federally declared disaster event, you may qualify for FEMA Individual Assistance. Register at DisasterAssistance.gov within 60 days of the disaster declaration. FEMA can provide:

• Rental assistance while your home is being repaired
• Home repair grants for uninsured losses
• Low-interest SBA disaster loans for additional repair costs
• Crisis counseling and case management services

FEMA assistance does not duplicate flood insurance payments — you can receive both for different categories of loss. Register even if you have flood insurance, as some losses may not be covered by your policy.

The 72-Hour Timeline That Defines Recovery

Timeline	Priority
0-6 hours	Safety check, document damage, call insurer
6-24 hours	Extract all standing water, begin removing wet materials
24-48 hours	Apply antimicrobial, start dehumidifiers, remove unsalvageable materials
48-72 hours	Continue drying, schedule adjuster, get contractor estimates
Day 4-7	Verify dryness with moisture meter, begin repair planning

The faster you move through this sequence, the better your outcome. Every 24 hours of delay increases mold colonization, deepens structural damage, and complicates your insurance claim. Take our free flood risk assessment to understand your specific exposure so you can prepare before the next flood.